REVERE — City and state officials on Sunday worked to find the cause of the Saturday fire that destroyed an iconic furniture and appliance store on Route 60, as smoke continued to billow from the building’s remnants well into the afternoon.

The fast-moving five-alarm blaze that demolished the landmark Sozio store on Route 60 caused explosions among appliances inside the store and parked cars nearby, officials said Saturday.

Three firefighters sustained minor injuries that did not require hospitalization, said Revere Fire Chief Chris Bright at the scene Saturday. No other injuries were reported.

The cause of the fire had not been determined Sunday. State Police investigators assigned to the state fire marshal’s office were on scene, but their investigation may not be completed for some time, according to Jennifer Mieth, a spokeswoman for the state Department of Fire Services.

The damage is estimated at $4 million to $5 million, Mieth said.

Neighbors and other Revere residents, many of them longtime customers of the store, visited the scene throughout the day Sunday to survey the damage. Many drivers passing on Route 60 or in the drive-through line at the Wendy’s next door stopped to take photos of the debris.

“To see that like that is just unbelievable,’’ said Amanda Pezzi, 38, of Revere. “Like another landmark in Revere — gone. It’s a mark of Revere that you just drive by and you see that’s just gone now.’’

Frank Gulla, 65, a Revere native, said he watched the fire burn Saturday afternoon.

“The smoke was billowing,’’ he said. “All black smoke because it’s a tar roof. . . . I haven’t seen a fire like this in a long time.’’

Gulla said he heard explosions, possibly from appliances inside blowing up.

Luis Del Rio, 51, who lives across the street from the store, said he watched the blaze for nearly two hours.

“It was big, huge,’’ Del Rio said while shoveling snow from his driveway. “They couldn’t stop it.’’

He first saw white smoke emanating from the building, but it soon turned darker and darker, Del Rio said.

“Then all the flames started to show up . . . then trucks came in from everywhere,’’ he said, referring to the multi-city response to the conflagration.

Del Rio, who has bought appliances from the store, said he heard explosions and felt vibrations during the fire.

About 9:45 a.m. Sunday, investigators could be seen entering the massive, blackened pile of debris, which had been coated in white overnight by fresh snow. The roof and most walls had collapsed, and charred appliances and tables were visible from the parking lot. Smoke continued to rise from multiple hot spots during the day.

A sign that read “Sozio’’ in curvy, light blue lettering lay on the right side of the structure, under a section that collapsed.

Rubble from the building, including bricks and signage, spilled into the lot, creating an expansive, chaotic scene for investigators. The fire’s large scale — and the instability of its remnants — made it difficult to access the site.

Early Sunday afternoon, Revere firefighters returned and sprayed water on hot spots in multiple areas of the Sozio complex.

Customers who visited the site Sunday remembered the store as a longtime establishment that retained the flair and aesthetic of the 1950s — led by a kind, dedicated owner.

“I think we’ve all bought appliances from him,’’ Remo Pezzi said, referring to the business’s owner, Chuck Sozio. “All of our appliances in all of our houses are all from Chuck.’’

Pezzi, 40, said Sozio was “the original big chain of appliance stores for the North Shore area, for us.’’ Pezzi’s family has shopped at Sozio for decades — at the Revere store and other locations, he said.

“My father bought the first big-screen TV, with the three lights that come out the front, from right here right in this room,’’ he said, pointing to the front right corner of the building, now an unrecognizable heap of burned materials.

And more than 40 years later, when the Pezzis got married, he said, “we put every appliance in our house from Chuck.’’

Gulla reminisced about the 1960s, when he said Sozio shined floodlights into the sky — as Hollywood theaters do at movie premieres — to attract customers.

“When you drove, when you looked, you always wanted to see where it was coming from,’’ he said.

While the spotlights have since gone away and the technology in the store has evolved, Sozio never abandoned his classic ’50s style, Gulla said.

The store kept its vintage mid-century signage on the exterior, and inside it sold modern appliances styled to resemble their predecessors from decades past.

“The refrigerators were orange, and you had different colors, and [it was] nostalgic-looking,’’ he said. “I used to go in and just look at the stuff.’’

Globe correspondent John Hilliard contributed to this report. J.D. Capelouto can be reached at jd.capelouto@globe.com. Jeremy C. Fox can be reached atjeremy.fox@globe.com.